From a similar model's tech sheet (and yours should have one hidden inside):
F7
Power to magnetron interrupted
1. Unplug microwave oven or disconnect power.
2. After 40 seconds, check to see whether this solves the problem.
3. Check resistance of the magnetron thermostat.
4. Check the magnetron. See this file for details.
5. Check wiring to the 1100W inverter and control system. See "Checking Inverters"
6. Check operation of all interlock switches. See this text file. Check door, hinge and cavity front alignment. Adjust as needed.
7. If switches operate correctly, replace 1100W inverter.
8. If problem persists, replace electronic control.
9. Plug in microwave oven or reconnect power.
You can find
helpful exploded view diagrams and order parts by entering your full
model number (KHHS179LSS2 without dashes or spaces) from the tag on the oven here.
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